package com.jeect.filter;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.jeect.domain.JwtUser;
import com.jeect.domain.LoginUser;
import com.jeect.util.JwtTokenUtils;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.stereotype.Component;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
public class JWTAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
    private ThreadLocal<Integer> rememberMe = new ThreadLocal<>();
    private AuthenticationManager authenticationManager;//=super.getAuthenticationManager();

    public JWTAuthenticationFilter(AuthenticationManager authenticationManager) {
        this.authenticationManager = authenticationManager;
    }

    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        try {
            LoginUser loginUser = new ObjectMapper().readValue(request.getInputStream(), LoginUser.class);
            System.out.println("Username="+loginUser.getUsername());
            rememberMe.set(loginUser.getRememberMe());
            return authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(loginUser.getUsername(),loginUser.getPassword(),new ArrayList<>()));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    // 成功验证后调用的方法
    // 如果验证成功，就生成token并返回
    @Override
    protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) {
        JwtUser jwtUser = (JwtUser)authResult.getPrincipal();
        System.out.println("jwtUser:" + jwtUser.toString());
        boolean isRemember = rememberMe.get() == 1;

        String role = "";
        Collection<? extends GrantedAuthority> authorities = jwtUser.getAuthorities();
        for (GrantedAuthority authority : authorities){
            role = authority.getAuthority();
        }

        String token = JwtTokenUtils.createToken(jwtUser.getUsername(), role, isRemember);

        response.setHeader("token", JwtTokenUtils.TOKEN_PREFIX + token);
    }

    @Override
    protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response, AuthenticationException failed) throws IOException {
        response.getWriter().write("authentication failed, reason: " + failed.getMessage());
    }
}
